Juventus reportedly sent a scout to watch Fernando in action during Porto’s midweek game against Zenit St Petersburg.
The Brazilian midfielder has been identified as a possible January transfer target for the current Italian League leaders.
The 24-year-old, thought to be valued at around €8m by the Italian club, played in all 90 minutes of the 0-0 Champions League encounter.
Porto may be wiling to listen to offers for the South American after they were demoted to the Europa League after finishing third in Group G.
Think you know your Italian football? Share your knowledge, tips and comments to win cash prizes in OLBG's World Cup tipster competition  - £10,000 to be won!